OVERVIEW OF THE IMMUNE SYSTEM
IMMUNITY INNATE AND ADAPTIVE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A person’s antibodies level never declines after receiving the vaccine
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People only have passive immunity to the flu for one year
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The flu virus evolves quickly
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The flu virus remains unchanged from year to year
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Detailed explanation-1: -Antigenic drift is an important reason why people can get flu multiple times over the course of their lives. Antigenic drift is also a primary reason why the composition of flu vaccines for use in the Northern and Southern Hemispheres is reviewed annually and updated as needed to keep up with evolving flu viruses.
Detailed explanation-2: -Why is it important to get a flu vaccine EVERY year? Flu viruses are constantly changing, so flu vaccines may be updated from one season to the next to protect against the viruses that research suggests will be common during the upcoming flu season. Your protection from a flu vaccine declines over time.
Detailed explanation-3: -The influenza virus changes over time. This is because of two processes known as antigen drift and antigen shift that cause the virus to change its appearance, which means that from year-to-year, your immune system can no longer recognize and protect you from it.
Detailed explanation-4: -A Quick Review. The flu shot is effective for about three to six months. And because the flu makes millions of people sick each year and is pretty contagious, health organizations recommend that nearly everyone older than 6 months get a flu vaccine annually, preferably around the start of flu season.